Electric heater



A. H. SIMMONS June 12,192

ELECTRIC HEATER Filed July 11, 1924 Inventor Albert H. simrnorfis will Z Ls Attornegy Patented June 12,

.QU NI TED STATES IPA-TENT OFFICE.

ALBERT H. summons, or our max, IIlLmoIs, AssieNoR 'ro unison ELECTItIC APPLI- nncn comranr', nconrona'rnn, or cnIcAo 'nLmoIs, A conronn'rron or nnw ELECTRIC HEATER.

Application filed July 11,

which are simpleand rugged in construc-- tion and which may be manufactured at low cost andeasily-assembled. I also provide a knock-down feature whereby the device may be conveniently separated into sections which may be nested together into a comparatively small space.

For a more complete understanding of my invention reference should be had to the accompanying drawing in which Fig. 1 is a plan view partially in section showing'an electric heater embodying my invention; Fig. 2 is a side elevation'of the heater shown in. Fig. 1;.Fig. 3 is a fragmentary sectional View along the line 33 of Fig. 1 looking in the .direction of the arrows; Fig. 4 is a fragmentary detail view showing the latch ing means for the detachable parts of the 4 heater; whileFig. 5 is a fragmentary sectional view along the line 5-5 'ofFig. 2 looking in the direction of the arrows.

Referring to the drawing, in carrying out my invention in one form I provide a metallic supporting grid 10 having openings 10*" on which thearticle to be heated is, placed- This gridmay be any convenient shape and is shown as rectangular. Around the sides of the grid isasupporting'flange 11 which is integral with the grid. The construction: of the grid and supporting flange is such that oppositely disposed grooves or recesses 12 and .13 are formed at the junction orbend between the grid and" .-th8. flange, these grooves opening downward on the lower side otthe grid. As shown, the upper .supporting surface ofthe grid is struck downward somewhat in forming the grooves12.

and 13 whereby a'ridge is formed around the edge, of the grid corresponding to the reces'ses 12 and 13 on the lower side. The grid and flange may be stamped from a sheet'of metal;

grid although, as shown, the two oppositely The peripheral recesses may, in factfform 1, 'afcontinuous recess .aroundthe edge of the- 1924. Serial No. 725,497.

disposed recesses 12 and 13 only may be utilized in supporting insulators 14 and 14' which in turn support a helical heating resistor wire 15. For convenience in manufacture the insulators 14 and 14" are made in sections, the insulator 14 being shown as comprising short end sections 16 and 17 and a longer central section 18, while the insulator 14 comprises two long sections 19 and 19*Pwhich are similar in construction to the section; 18. The insulators are provided with longitudinal ridges 20 which seat in the grooves 12 and 13, and they are secured in the grooves by means of brackets 21 secured bysuitable bolts or rivets tothe flange v11.

Spaced along thelengths of the insulators 14and 14 are downwardly extending hookshaped projections 22, and the construction and arrangement of the sections 16 to 19 inclusive is such that these projections, with the exception of the outer projections on the short sections 16 and 17, are in staggered relation from sideto side of the grid. The resistance conductor 15is looped around the projections 22 and passed from side to side of the grid in substantially parallel lengths. The lengths of the resistance conductor are supported centrally by means of a transverse bar 15" of insulating material provided with apertures through which the resistance conductor passes and secured at its ends to the sides of the grid. As shown, the short insulator sections-16 and 17 are each provided with two projections 22, while the longer,

sections .18, 19 and 19 are each provided with three projections. The two projec' tions on the short sections are spaced close-- 1y together whereby the outer projections of the short sectionsare opposite the outer projections of the long sections and form a support for the ends of the resistance con; ductor. The. ends of the resistance conductor are bent around theouter projec- I grid. These terminalpins project outward and form a convenientmeans -for connecting the resistanceconductor 15 to a suitable electrical source" of supply. The electrical connection may be established by means of an attachment plug of any suitable well known form. A guard 25 is provided around the terminal pins.

A handle 30 is attachedto one side of the grid, preferably to the side opposite'the terminal pins 23 and 24. This handle is secured by means. of a bolt 31 extending centrally of the handle and entering a nut 32 which is seated in a plate 33 secured to the flange 11, the plate 33 being struck outward to provide a space in which the nut is seated and secured against rotation.

The grid with the, heating unit, handle and various other parts previously de-" scribed forms a unitary structure, the body of the heater. This body member is detachably secured to a supporting member comprising a reflector plate 35 to which legs 36 are secured. Preferably, the edge of the reflector plate is struck downward slightly and forms a support on which the body member rests, the central portion of the reflector plate fitting into the body member, as shown in Fig. 5. The bod and supporting member are secured toget er on one side by means of ears 37 struck upward and outward from the metal of the reflector. These ears form locking projections and extend through apertures 38 in one side of the body. On the side opposite the projections 37 the body and supporting member are secured together by means of a latching arm 39 secured to the reflector plate and having a projection 40 which extends upward through an aperture 41 in the reflector plate and through an aperture 42 in the side of the body. A protuberance 43 is provided on the reflector plate for holding the arm 39 in latching position. By retracting the arm it will be observed that the projection 40 can be withdrawn from aperture 42 so that the body member can be tilted upward and released from the supporting member. The body and supporting member may then be nested together into the smallest possible space for shipment.

While I have described my invention as embodied in concrete form and as operating in a specific manner in accordance with the provisions of the patent statutes, it

should be understood that I do not limit my invention thereto, since various modifications thereof will suggest themselves to those skilled in the art'without departing from the spirit of my invention, the scope of which is set forth in the annexed claims.

What I claim as new and desire to secure by Letters Patent of the United States is 1. An electric heater comprising a grid provided with oppositely disposed elongated recesses, insulators removably secured to said grid in said recesses, projections on said insulators, and a resistance conductor supported by said projections.

2. An electric heater comprising agrid provided with elongated recesses at opposite sides in its lower surface, insulators secured to said grid in said-recesses, and a resistance conductor supported by said insulators.

3. An. electric heater comprising a grid provided with longitudinally disposed recesses at opposite sides, insulators having portions fitting in said recesses, means for holding said insulators in said recesses whereby saidinsulators are secured to said grid, and a resistance conductor supported by said insulators.

4. An electric heater comprising a grid provided with elongated recesses at opposite sides on its lower surface, insulators clamped in said recesses so as to be secured to said grid projections on said insulators, and a resistance conductor looped around said projections extending from side to side of said grid.

5. An electric heater comprising a grid provided with recesses at opposite sides, insulators provided with upwardly extending ridges fitting in said recesses and downwardly extending hook shaped projections, means for securing said insulators in said recesses, and a resistance conductor supported by said projections and passing from side to side of said grid.

6. An electric heater comprising a metal grid formed with ridges at opposite sides on its upper surface and with grooves in its lower surface corresponding with said ridges, insulators fitting in said grooves provided with projections, meansfor clamping said insulators in said grooves whereby said insulators are secured, and a sinuous resistance conductor supported by said projections.

7. An electric heater comprising a metal grid formed with grooves at opposite sides in its lower surface, a plurality of separate insulators fitting in each of said grooves, said insulators being provided with projections, means for clamping said insulators in said grooves whereby said insulators are secured, and a sinuous resistance conductor supported by said projections.

8. An electric heater comprising a grid having its sides bent downward to provide a support and so as-to form oppositely disposed recesses at the bends, insulators clamped in said recesses provided with hook shaped projections, and a resistance conductor looped around said projections and passing from side to side of said grid.

9. An electric heater comprising a grid having its sides bent downward to provide a support and so as to form oppositely disposed recesses at the bends, insulators provided with upwardly extending ridges fitting in said recesses anddownwardly extending hook shaped projections, means secured to the sides of said grid for securing said insulators, and a resistance conductor looped around said projections and passing securing said insulators in said grooves, a from side to side of said grid. I resistance conductor looped around said 10. An electric heater comprising a body hooks and passing from side to side of said member including a grid having its sides grid, a supporting member including a re- 5 bent downward to provide a support for the fiector plate, legs secured to said plate, and 15 grid and so as to form oppositely disposed means for detachably securing said body grooves underneath the grid at'the junction member to said supporting member.

ofthe sides, insulators fitting in said grooves In witness whereof, I have hereunto set provided with downwardly pro'ecting my hand this 2nd day of July, 1924.

l hooks, clamping members on said si es for ALBERT H. SIMMONS. 

